• 文献标题:   Chiral states in bilayer graphene: Magnetic field dependence and gap opening
  • 文献类型:   Article
  • 作  者:   ZARENIA M, PEREIRA JM, FARIAS GA, PEETERS FM
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   1098-0121
  • 通讯作者地址:   Univ Antwerp
  • 被引频次:   33
  • DOI:   10.1103/PhysRevB.84.125451
  • 出版年:   2011

▎ 摘  要

At the interface of electrostatic potential kink profiles, one-dimensional chiral states are found in bilayer graphene (BLG). Such structures can be created by applying an asymmetric potential to the upper and the lower layers of BLG. We found the following: (i) due to the strong confinement by the single kink profile, the unidirectional states are only weakly affected by a magnetic field; (ii) increasing the smoothness of the kink potential results in additional bound states, which are topologically different from those chiral states; and (iii) in the presence of a kink-antikink potential, the overlap between the oppositely moving chiral states results in the appearance of crossing and anticrossing points in the energy spectrum. This leads to the opening of tunable minigaps in the spectrum of the unidirectional topological states.